Datasheet > UBA2074AT

UBA2074AT

更新时间： 2024-11-12 01:06:23

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
33页	1618K
描述
High Voltage Full-bridge control IC for CCFL backlighting

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UBA2074AT 数据手册

UBA2074(A)

High Voltage Full-bridge control IC for CCFL backlighting

Rev. 02.0 — February 2007

Preliminary data sheet

1. General description

The UBA2074 is a high voltage IC intended to drive Cold Cathode Fluorescent Lamps

(CCFLs) for back-lighting applications. The IC contains level-shifters, bootstrap diodes

and drivers for the external full-bridge power switches.

Furthermore, the UBA2074 has a build-in HF oscillator which determines the operating

frequency, a phase shift controller for obtaining constant lamp current, and a PWM

generator which is used to set the brightness level of the CCFLs.

Multiple inverters can be synchronized to a single operating frequency, while maintaining

constant lamp current. Also, PWM dimming can be synchronized by either using the

internal PWM generator, or by using an externally applied PWM signal.

The UBA2074 is designed to operate in a very wide inverter supply voltage range. The IC

can be conﬁgured to be supplied directly from a low voltage supply up to 30 V DC. The

fullbridge voltage can range up to 550V.

The A-version has no hardswitching protection in order to suit medium voltage (e.g 60V)

full bridge systems.

2. Features

Suitable for operating in a very wide inverter supply voltage range (up to 550 V DC for

SO28 package, up to 225 V for SSOP28 package)

Wide IC supply voltage range (9 V to 30 V DC)

Suitable for synchronizing multiple inverters to a single operating frequency with equal

lamp current phase

Adjustable maximum fault timing

Integrated level-shifters

Integrated bootstrap diodes

Lamp current control

Over-voltage control

Over-current protection

Ignition failure detection

Hard-switching control (not in the A-version)

Arcing detection

Brightness level adjustment through PWM dimming

Integrated PWM generator

12 3 4 5 6 7...33

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